Alright, I have a quiz on this tomorrow and i also can't finish my homework. =/

Any help is appreciated.

Ex 1) Explain how the graph of y = cos(x - /3) can be obtained from the graph of y = cos x.

Here, I'm just not sure what they are asking?

Ex 2) A pendulum swings through an angle of 20 degrees each second. If the pendulum is 40 inches long, how far does the tip move each second?

Not sure on this one. I remember something about Linear velocity and/or angular velocity but i could be completely off.

Thanks.